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Cu + 2AgNo3 → Cu(NO3)2 + 2Ag
-in small beaker (100-250 mL), weigh beaker
-Add 3.00 OR LESS of AgNo3, weigh AgNo3
-Weigh copper penny
-Add 80 mL H2O
-Heat and dissolve (warm, not boil)
-Put copper penny into AgNo3(aq) –observe
-Allow to sit overnight
-Wash/ decant, then dry
-weigh silver and penny
Data: beaker= 67.95 g penny= 3.14 g silver (after drying) = 2.03 g copper reacted= .58 g
Calculations: use stoichiometry to find Ag predicted
1. grams → mol Cu
(penny – copper reacted) 2.56 x 1/63.55= .0403
2. mol →mol (ratio)
.0403 x 2/1= .0806 mol Ag
3. mol → grams
.0806 mol Ag x 107.9/1= 8.70 g
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